impossible to guard againstの例文

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1. But he conceded it is impossible to guard against " completely insane acts ."
2. It is impossible to guard against all the potential risks, but simple procedural advice could save lives.
3. Mayor Michael Bloomberg says it's impossible to guard against all the different ways terrorists can do damage in New York.
4. Heckscher declared on Swedish television that his officers could give adequate protection to the Olympics, but conceded that it is impossible to guard against " completely insane acts ."
5. "Because this was such a soft target, it's impossible to guard against something like this, " said Vincent M . Cannistraro, a former counterterrorism official at the Central Intelligence Agency.